id:A076786 - OEIS Search Results

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Square-free numbers such that in decimal representation all their prefixes are also square-free.

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1, 2, 3, 5, 6, 7, 10, 11, 13, 14, 15, 17, 19, 21, 22, 23, 26, 29, 30, 31, 33, 34, 35, 37, 38, 39, 51, 53, 55, 57, 58, 59, 61, 62, 65, 66, 67, 69, 70, 71, 73, 74, 77, 78, 79, 101, 102, 103, 105, 106, 107, 109, 110, 111, 113, 114, 115, 118, 119, 130, 131, 133, 134, 137 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`m is a term iff A008966(floor(m/10^k))=1 for 0<=k<=A004216(n);` `a(n)=A005117(n) for n<=26, but A005117(27)=41 is not a term, as 4=2^2 is not square-free.`
	EXAMPLE	`143=1113 is a term, as also 14=27 and 1 are square-free.`
	CROSSREFS	`Sequence in context: A005117 A144338 A077377 this_sequence A167171 A087008 A077337` `Adjacent sequences: A076783 A076784 A076785 this_sequence A076787 A076788 A076789`
	KEYWORD	`nonn,base`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 16 2002`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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